Books regarding porcelain and pottery backstamps

SMITHSONIAN INFORMATION
Porcelain and Pottery Marks: A Selected Bibliography / English language
www.si.edu/Encyclopedia_SI/nmah/potmarks.htm

E books

CHAFFERS, William (1866), Marks and monograms on pottery and porcelain: with historical notices of each Manufactury, J. Davy & Sons London / Englisch language

HOPPER, William (1894), A manual of marks on pottery and porcelain; a dictionary of easy reference , London, Macmillan and co./ Englisch language